Team EasyExamNotes

Prob. Let (A, ) be a semigroup. Show that for a, b, c ∈ A, if ac = ca and bc = cb, then (ab)c … Read more

Prob. Let ({a, b}, * ) be a semigroup where aa =b. Show that- ab=b*a. Sol. Given ({a*b}, *) is a semigroup And a*a = … Read more

Prob. Show that the set I of all integers (…, -4, -3, -2, -1, 0, 1, 2, 3, 4,…}. Is a group with respect to … Read more